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Eastern Steel Manufacturing Co.,Ltd is a leading manufacturer and distributor of seamless steel pipe, welded steel pipe, OCTG products and fittings. We supply first-step processing, semi-finished parts and finished parts to help our clients meet fabrication requirements beyond their capacity or to improve operations by moving forward the pre-production processing.
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Facility
Eastern Steel Manufacturing Co.,Ltd not only improve product production and sales services, but also provide additional value-added services. As long as you need, we can complete your specific needs together.
Projects
Many years of large-scale project experience in various fields（Oil & Gas, Construction, Power Energy, Marine & Offshore, Water Treatment, Exploration & Drilling Services, Pipeline & Petrochemical etc.）, professional project team is responsible from receiving until the end of the project.
Carbon steel pipes are widely used in oil and gas, chemical, boiler pressure systems, and urban water supply. The yield strength and allowable stress of carbon steel change with different temperatures, therefore its maximum allowable pressure also varies with temperature. The higher the operating temperature of the carbon steel pipe, the lower the allowable stress, and consequently, the lower the maximum pressure.
The maximum allowable pressure (kPa) changes with temperature, and its calculation formula is:
P = 2St/(D−t)
Where:
P = Maximum allowable pressure
S = Allowable stress (MPa, varying with temperature)
t = Wall thickness
D = Outer diameter
|
Nominal Size |
Schedule no. |
Wall Thickness |
Maximum Allowable Pressure (kPa) |
||||||||
|
Temperature (oC) |
|||||||||||
|
-29 - 38 |
205 |
260 |
350 |
370 |
400 |
4301) |
450 |
||||
|
Maximum Allowable Stress (MPa) |
|||||||||||
|
137.8 |
137.8 |
130.2 |
117.1 |
115.7 |
89.6 |
74.4 |
59.9 |
||||
|
15 |
STD |
40 |
2.77 |
34416 |
34416 |
32528 |
29255 |
28910 |
22372 |
18589 |
14972 |
|
XS |
80 |
3.73 |
48092 |
48092 |
45466 |
40878 |
40396 |
31260 |
25969 |
20918 |
|
|
160 |
4.78 |
62830 |
62830 |
59378 |
53404 |
52777 |
40837 |
33929 |
27333 |
||
|
XXS |
7.47 |
98245 |
98245 |
92836 |
83507 |
82522 |
63857 |
53053 |
42739 |
||
|
20 |
STD |
40 |
2.87 |
28070 |
28070 |
26526 |
23860 |
23578 |
18245 |
15158 |
12209 |
|
XS |
80 |
3.91 |
39418 |
39418 |
37247 |
33506 |
33106 |
25617 |
21283 |
17142 |
|
|
160 |
5.56 |
58152 |
58152 |
54955 |
49429 |
48843 |
37799 |
31398 |
25293 |
||
|
XXS |
7.82 |
83107 |
83107 |
78539 |
70643 |
69809 |
54024 |
44881 |
36152 |
||
|
25 |
STD |
40 |
3.38 |
26251 |
26251 |
24804 |
22310 |
22048 |
17060 |
14173 |
11417 |
|
XS |
80 |
4.55 |
36283 |
36283 |
34285 |
30862 |
30474 |
23584 |
19595 |
15785 |
|
|
160 |
6.35 |
52481 |
52481 |
49594 |
44606 |
44082 |
34112 |
28339 |
22827 |
||
|
XXS |
9.09 |
77030 |
77030 |
72793 |
65476 |
64704 |
50070 |
41595 |
33506 |
||
|
32 |
STD |
40 |
3.56 |
21614 |
21614 |
20421 |
18369 |
18155 |
14049 |
11672 |
9404 |
|
XS |
80 |
4.85 |
30178 |
30178 |
28518 |
25651 |
25348 |
19616 |
16295 |
13125 |
|
|
160 |
6.35 |
40596 |
40596 |
38364 |
34505 |
34099 |
26389 |
21924 |
17659 |
||
|
XXS |
9.70 |
64601 |
64601 |
61045 |
54906 |
54266 |
41988 |
34884 |
28097 |
||
|
40 |
STD |
40 |
3.68 |
19444 |
19444 |
18375 |
16529 |
16329 |
12636 |
10550 |
8454 |
|
XS |
80 |
5.08 |
27402 |
27402 |
25900 |
23295 |
23019 |
17811 |
14800 |
11919 |
|
|
160 |
7.14 |
39738 |
39738 |
37599 |
33816 |
33416 |
25858 |
21483 |
17308 |
||
|
XXS |
10.16 |
58779 |
58799 |
55547 |
49966 |
49374 |
38205 |
31742 |
25569 |
||
|
50 |
STD |
40 |
3.91 |
16378 |
16378 |
15468 |
13925 |
13759 |
10645 |
8847 |
7124 |
|
XS |
80 |
5.54 |
23653 |
23653 |
22351 |
20105 |
19871 |
15378 |
12774 |
10287 |
|
|
160 |
8.74 |
38866 |
38866 |
36731 |
33037 |
32652 |
25266 |
20987 |
16908 |
||
|
XXS |
11.07 |
50793 |
50793 |
48003 |
43173 |
42670 |
33017 |
27429 |
22096 |
||
|
65 |
STD |
40 |
5.16 |
17914 |
17914 |
16929 |
15227 |
15048 |
11644 |
9674 |
7793 |
|
XS |
80 |
7.01 |
24818 |
24818 |
23447 |
21097 |
20849 |
16129 |
13401 |
10797 |
|
|
160 |
9.53 |
34615 |
34615 |
32714 |
29420 |
29076 |
22503 |
18693 |
15055 |
||
|
XXS |
14.02 |
53081 |
53081 |
50159 |
45116 |
44585 |
34498 |
28662 |
23088 |
||
|
80 |
STD |
40 |
5.49 |
15558 |
15558 |
14969 |
13222 |
13063 |
10108 |
8399 |
6766 |
|
XS |
80 |
7.62 |
21986 |
21968 |
20780 |
18693 |
18472 |
14290 |
11871 |
9563 |
|
|
160 |
11.13 |
33079 |
33079 |
31253 |
28111 |
27780 |
21497 |
17859 |
14386 |
||
|
XXS |
15.24 |
46976 |
46976 |
44392 |
39928 |
39459 |
30536 |
25369 |
20436 |
||
|
100 |
STD |
40 |
6.02 |
13187 |
13187 |
12464 |
11210 |
11079 |
8571 |
7124 |
5739 |
|
XS |
80 |
8.56 |
19058 |
19058 |
18010 |
16198 |
16012 |
12388 |
12094 |
8289 |
|
|
120 |
11.13 |
25190 |
25190 |
23805 |
21407 |
21159 |
16371 |
13601 |
10995 |
||
|
160 |
13.49 |
31019 |
31019 |
29310 |
26368 |
26058 |
20160 |
16750 |
13208 |
||
|
XXS |
17.12 |
40348 |
40348 |
38129 |
34298 |
33892 |
26230 |
21786 |
17549 |
||
|
125 |
STD |
40 |
6.55 |
11561 |
11561 |
10921 |
9825 |
9708 |
7510 |
6243 |
5038 |
|
XS |
80 |
9.53 |
17060 |
17060 |
16122 |
14503 |
14331 |
11093 |
9212 |
7421 |
|
|
120 |
12.70 |
23130 |
23130 |
21855 |
19657 |
19430 |
15034 |
12492 |
10059 |
||
|
160 |
15.88 |
29407 |
29407 |
27787 |
24997 |
24701 |
19113 |
15881 |
12795 |
||
|
XXS |
19.05 |
35897 |
35897 |
33926 |
30516 |
30158 |
23337 |
19388 |
15620 |
||
|
150 |
STD |
40 |
7.11 |
10550 |
10550 |
9928 |
8924 |
8819 |
6828 |
5370 |
4568 |
|
XS |
80 |
10.97 |
16474 |
16474 |
15571 |
14007 |
13842 |
10707 |
8895 |
7165 |
|
|
120 |
14.27 |
21745 |
21745 |
20553 |
18448 |
18265 |
14138 |
11747 |
9460 |
||
|
XXS |
160 |
18.26 |
28325 |
28325 |
26768 |
24074 |
23784 |
18410 |
15296 |
12319 |
|
|
200 |
20 |
6.35 |
7138 |
7138 |
6745 |
6063 |
5994 |
4637 |
3852 |
3100 |
|
|
30 |
7.04 |
7924 |
7924 |
7489 |
6732 |
6656 |
5147 |
4279 |
3445 |
||
|
STD |
40 |
8.18 |
9246 |
9246 |
8737 |
7855 |
7765 |
6008 |
4995 |
4024 |
|
|
60 |
10.31 |
11741 |
11741 |
11093 |
9977 |
9860 |
7627 |
6339 |
5105 |
||
|
XS |
80 |
12.70 |
14572 |
14572 |
13766 |
12388 |
12237 |
9474 |
7868 |
6338 |
|
|
100 |
15.09 |
17452 |
17452 |
16488 |
14834 |
14655 |
11341 |
9426 |
7593 |
||
|
120 |
18.26 |
21345 |
21345 |
20174 |
18148 |
17935 |
13876 |
11527 |
9288 |
||
|
140 |
20.62 |
24308 |
24308 |
22971 |
20656 |
20415 |
15799 |
13125 |
10569 |
||
|
XXS |
22.23 |
26334 |
26334 |
24877 |
22386 |
22124 |
17115 |
14221 |
11458 |
||
|
160 |
23.01 |
27340 |
27340 |
25838 |
23240 |
22964 |
17769 |
14765 |
11892 |
||
|
250 |
20 |
6.35 |
5698 |
5698 |
5388 |
4844 |
4789 |
3707 |
3080 |
2480 |
|
|
30 |
7.8 |
7028 |
7028 |
6642 |
5974 |
5905 |
4568 |
3796 |
3059 |
||
|
STD |
40 |
9.27 |
8385 |
8385 |
7923 |
7131 |
7048 |
5450 |
4527 |
3652 |
|
|
XS |
60 |
12.7 |
11596 |
11596 |
10955 |
9853 |
9736 |
7538 |
6263 |
5043 |
|
|
80 |
15.09 |
13863 |
13863 |
13098 |
11781 |
11644 |
9012 |
7483 |
6028 |
||
|
100 |
18.26 |
16922 |
16922 |
15992 |
14386 |
14214 |
10996 |
9136 |
7359 |
||
|
120 |
21.44 |
20036 |
20036 |
18934 |
17032 |
16825 |
13022 |
10817 |
8716 |
||
|
XXS |
140 |
25.4 |
23998 |
23998 |
16474 |
20394 |
20153 |
15599 |
12960 |
10438 |
|
|
160 |
28.58 |
27229 |
27229 |
25734 |
23143 |
22875 |
17700 |
14703 |
11844 |
||
|
300 |
20 |
6.35 |
4795 |
4795 |
4534 |
4072 |
4024 |
3114 |
2591 |
2088 |
|
|
30 |
8.38 |
6359 |
6359 |
6008 |
5402 |
5540 |
4134 |
3431 |
2763 |
||
|
STD |
9.53 |
7241 |
7241 |
6842 |
6153 |
6084 |
4706 |
3914 |
3149 |
||
|
40 |
10.31 |
7854 |
7854 |
7421 |
6676 |
6601 |
5015 |
4244 |
3417 |
||
|
XS |
12.70 |
9722 |
9722 |
9191 |
8268 |
8165 |
6318 |
5250 |
4230 |
||
|
60 |
14.27 |
10969 |
10969 |
10363 |
9322 |
9212 |
7131 |
5925 |
4768 |
||
|
80 |
17.48 |
13525 |
13525 |
12850 |
11492 |
11362 |
8792 |
7303 |
5884 |
||
|
100 |
21.44 |
16736 |
16736 |
15819 |
14227 |
14062 |
10879 |
9040 |
7283 |
||
|
XXS |
120 |
25.4 |
20015 |
20015 |
18913 |
17011 |
16811 |
13008 |
10804 |
8702 |
|
|
140 |
28.58 |
22682 |
22682 |
21435 |
19278 |
19051 |
14744 |
12244 |
9866 |
||
|
160 |
33.32 |
26740 |
26740 |
25273 |
22730 |
22461 |
17383 |
14441 |
11630 |
||
|
350 |
10 |
6.35 |
4361 |
4361 |
4120 |
3707 |
3665 |
2831 |
2356 |
1895 |
|
|
20 |
7.92 |
5457 |
5457 |
5161 |
4644 |
4589 |
3548 |
2949 |
2377 |
||
|
STD |
30 |
9.53 |
6580 |
6580 |
6222 |
5595 |
5533 |
4279 |
3555 |
2866 |
|
|
40 |
11.13 |
7717 |
7717 |
7310 |
6559 |
6477 |
5016 |
4168 |
3355 |
||
|
XS |
12.70 |
8833 |
8833 |
8351 |
7510 |
7421 |
5739 |
4768 |
3845 |
||
|
60 |
15.09 |
10541 |
10541 |
9963 |
8964 |
8861 |
6855 |
5691 |
4589 |
||
|
80 |
19.05 |
13421 |
13421 |
12684 |
11410 |
11272 |
9723 |
7248 |
5836 |
||
|
100 |
23.83 |
16949 |
16949 |
16019 |
14407 |
14242 |
11017 |
9157 |
7372 |
||
|
120 |
27.79 |
19933 |
19933 |
18837 |
16943 |
16743 |
12960 |
10762 |
8675 |
||
|
140 |
31.75 |
22964 |
22964 |
21703 |
19519 |
19292 |
14931 |
12402 |
9990 |
||
|
160 |
35.71 |
26051 |
26051 |
24618 |
22144 |
21883 |
16936 |
14069 |
11334 |
||
|
400 |
10 |
6.35 |
3810 |
3810 |
3603 |
3238 |
3197 |
2474 |
2060 |
1660 |
|
|
20 |
7.92 |
4768 |
4768 |
4507 |
4051 |
4004 |
3100 |
2577 |
2074 |
||
|
STD |
30 |
9.53 |
5746 |
5746 |
5429 |
4885 |
4830 |
3734 |
3100 |
2501 |
|
|
XS |
40 |
12.70 |
7703 |
7703 |
7283 |
6545 |
6470 |
5009 |
4126 |
3349 |
|
|
60 |
16.66 |
10176 |
10176 |
9618 |
8654 |
8550 |
6614 |
5498 |
4430 |
||
|
80 |
21.44 |
13208 |
13208 |
12478 |
11224 |
11093 |
8585 |
7131 |
5746 |
||
|
100 |
26.19 |
16274 |
16274 |
15378 |
13835 |
13670 |
10576 |
8785 |
7076 |
||
|
120 |
30.96 |
19409 |
19409 |
18341 |
16481 |
16302 |
12616 |
10480 |
8440 |
||
|
140 |
36.53 |
23130 |
23130 |
21855 |
19657 |
19430 |
15034 |
12492 |
10059 |
||
|
160 |
40.49 |
25824 |
25824 |
24404 |
21952 |
21697 |
16784 |
13945 |
11238 |
||
|
450 |
10 |
6.35 |
3383 |
3383 |
3197 |
2873 |
2839 |
2198 |
1826 |
1474 |
|
|
20 |
7.92 |
4230 |
4230 |
3996 |
3597 |
3555 |
2749 |
2287 |
1839 |
||
|
STD |
9.53 |
5099 |
5099 |
4816 |
4334 |
4286 |
3314 |
2756 |
2219 |
||
|
XS |
30 |
11.13 |
5967 |
5967 |
5643 |
5071 |
5016 |
3879 |
3225 |
2598 |
|
|
12.70 |
6835 |
6835 |
6456 |
5808 |
5739 |
4437 |
3686 |
2969 |
|||
|
40 |
14.27 |
7696 |
7696 |
7276 |
6545 |
6463 |
5002 |
4155 |
3349 |
||
|
60 |
19.05 |
10349 |
10349 |
9784 |
8799 |
8695 |
6725 |
5588 |
4499 |
||
|
80 |
23.83 |
13043 |
13043 |
12326 |
11086 |
10955 |
8475 |
7042 |
5670 |
||
|
100 |
29.36 |
16219 |
16219 |
15323 |
13787 |
13622 |
10542 |
8757 |
7055 |
||
|
120 |
34.93 |
19464 |
19464 |
18389 |
16543 |
16350 |
12650 |
10507 |
8468 |
||
|
140 |
39.67 |
22282 |
22282 |
21056 |
18941 |
18713 |
11483 |
12030 |
9694 |
||
|
160 |
45.24 |
25638 |
25638 |
24225 |
21793 |
21531 |
16660 |
13842 |
11155 |
||
|
500 |
10 |
6.35 |
3038 |
3038 |
2873 |
2574 |
2556 |
1977 |
1640 |
1323 |
|
|
STD |
20 |
9.53 |
4582 |
4582 |
4327 |
3893 |
3852 |
2976 |
2474 |
1991 |
|
|
XS |
30 |
12.70 |
6139 |
6139 |
5801 |
5216 |
5154 |
3989 |
3314 |
2666 |
|
|
40 |
15.09 |
7317 |
7317 |
6911 |
6215 |
6146 |
4754 |
3948 |
3183 |
||
|
60 |
20.62 |
10080 |
10080 |
9522 |
8564 |
8468 |
6552 |
5443 |
4382 |
||
|
80 |
26.19 |
12898 |
12898 |
12188 |
10962 |
10831 |
8385 |
6966 |
5608 |
||
|
100 |
32.54 |
16171 |
16171 |
15287 |
13746 |
13580 |
10514 |
8730 |
7035 |
||
|
120 |
38.10 |
19085 |
19085 |
18037 |
16226 |
16033 |
12409 |
10307 |
8302 |
||
|
140 |
44.45 |
22475 |
22475 |
21242 |
19106 |
18879 |
14614 |
12140 |
9777 |
||
|
160 |
50.01 |
25450 |
25450 |
24094 |
21675 |
21421 |
16577 |
13766 |
11093 |
||
|
600 |
10 |
6.35 |
2529 |
2529 |
2391 |
2150 |
2129 |
1647 |
1364 |
1102 |
|
|
STD |
20 |
9.53 |
3810 |
3810 |
3603 |
3238 |
3197 |
2474 |
2060 |
1660 |
|
|
XS |
12.70 |
5097 |
5097 |
4816 |
4334 |
4286 |
3314 |
2756 |
2219 |
||
|
30 |
14.27 |
5739 |
5739 |
5423 |
4878 |
4823 |
3734 |
3100 |
2494 |
||
|
40 |
17.48 |
7055 |
7055 |
6670 |
5994 |
5925 |
4589 |
3810 |
3066 |
||
|
60 |
24.61 |
10018 |
10018 |
9467 |
8516 |
8420 |
6511 |
5409 |
4361 |
||
|
80 |
30.96 |
12691 |
12691 |
12002 |
10783 |
10659 |
8254 |
6856 |
5519 |
||
|
100 |
38.89 |
16102 |
16102 |
15220 |
13690 |
10528 |
10466 |
8695 |
7007 |
||
|
120 |
46.02 |
19223 |
19223 |
18168 |
16336 |
16150 |
12491 |
10383 |
8364 |
||
|
140 |
52.37 |
22048 |
22048 |
20835 |
18741 |
18520 |
14331 |
11906 |
9591 |
||
|
160 |
59.54 |
25279 |
25279 |
23888 |
21489 |
21235 |
16433 |
13649 |
10996 |
||
Because carbon can graphitize (carbon transforms into graphite), carbon steel pipes should be avoided in environments with temperatures above 425°C. Alloy steel pipes should be used instead.
SCH 40 carbon steel pipe: Standard pressure
SCH 80 carbon steel pipe: Medium to high pressure
SCH 160 / XXS: High pressure / High temperature system
The higher the using temperature of carbon steel pipes, the lower the pressure, especially at temperatures above 400°C where the pressure drop is most significant.
A106 Gr.B: Medium to high temperature
A53 Gr.B: Normal pressure
API 5L: Oil and gas transportation
Yes. Higher temperature reduces allowable stress, thus reducing pressure rating.
Yes, especially A106 Gr.B/Gr.C, but pressure decreases above 400°C.
The pressure rating of carbon steel pipes is determined by wall thickness, temperature, and material grade. Higher temperatures result in lower allowable stress and consequently lower maximum pressure. SCH80 is suitable for medium to high pressure systems; SCH160/XXS is suitable for high pressure systems. Pressure decay requires special verification under high-temperature conditions (>400°C).
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